C / C++ / MFC

Re: Mute the volume in Windows XP

1-Feb-05 3:51

It appears to be MMSYSERR_BADDEVICEID. What does the call to mixerOpen() look like?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Aneurysm001-Feb-05 5:58

Aneurysm00

1-Feb-05 5:58

Thanks for the help DavidCrow, but I got it fixed now. I was calling mixerOpen like this

if (mixerOpen(&hMixer, MIXER_OBJECTF_HMIXER, 0, 0, 0) != MMSYSERR_NOERROR)
return FALSE;

It worked on Windows98, but not on XP, only when I re-read the documentation did I change the second parameter to 0.

how to read hexadecimal input in an editbox

cbaykal31-Jan-05 7:03

cbaykal

31-Jan-05 7:03

I am a beginner at Visual C++. I created an editbox with an dword variable. I would like to enter hexadecimal values in the format for example 004FD210 and i want the corresponding variable for the editbox or (maybe with a small code others) to have corresponding decimal value. I thought to read into a string andthen to convert it to integer value. But is there a shorter way. Pls.

Re: how to read hexadecimal input in an editbox

John R. Shaw31-Jan-05 7:39

John R. Shaw

31-Jan-05 7:39

converting string to interger: value strtol(), strtoul().
converting interger value to hex string: sprintf(pStr,"%X",nValue).
If you want to convert to hex string with leading 0's:
sprintf(pStr,"%8.8,X",nValue); // 00000000
Or
sprintf(pStr,"%*.*,X",8,8,nValue); // 00000000

I believe those should work for ASCII formated string.

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen

Get out of infinite loop question!

jazzkiller31-Jan-05 6:58

jazzkiller

31-Jan-05 6:58

Hi all,
I am writing a program that continuously stores data from an external memory.
while(isConnected)
{
// Do stuff over here
}// end while

However, when it runs, it takes all the memory (program is not responded).
I have another button (Stop) to call method to set isConnected to False in order to get out of the loop. However, I didn't even have a chance to hit that button because the program is freezed.

Any suggestions? Thanks.

Re: Get out of infinite loop question!

PJ Arends31-Jan-05 7:13

Re: Get out of infinite loop question!

31-Jan-05 7:13

http://www.codeproject.com/threads/usingworkerthreads.asp[^]

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Honoured as one of The Most Helpful Members of 2004

Aneurysm0031-Jan-05 7:17

Aneurysm00

31-Jan-05 7:17

Use a worker thread. If you don;t thread the application, then the reason you're locking the program up is because the Message Loop never has the chance to run, and therefore the button press is never noticed. Use a thread for the user interface, and one to do the loop.

Re: Get out of infinite loop question!

Tim Smith31-Jan-05 13:44

Tim Smith

31-Jan-05 13:44

An alternative is to pump the message queue every n iterations of the loop. There is no need to create a worker thread.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

how to add a menu to a CDialogBar

vieira_alice31-Jan-05 5:51

vieira_alice

31-Jan-05 5:51

Hello,

I'm writing to ask some explanations on the excellent article "Using Custom Controls in a Dialog Bar" by Douglas R. Keesler, see http://www.codeproject.com/useritems/DerivedDlgBar.asp. Maybe that I did not understand everything, I'm french and my english is not so good.

So my matter is about how to create a menu in a CDialogBar :

I have made a little MDI which has got a CDialogBar with VC++6.0 .

In this class, I want to put a Menu.
So I made that you said :
- create a CDialogBar : IDD_DLGBAR_TEST,
- create a Menu in my ressource : IDD_DLGBAR_TEST,
- create the class MyDlgBar (import files MyDlgBar, remove file.clw and clic on ctrl+w to wizard VC6.0 as he said)
- select to this ressource the classe MyDlgBar
- put in the class CMainFrame the instance : CMyDlgBar m_dlgBarTest
- put the creation of this box in the create function of the CMainFrame with :

m_dlgBarTest.Create(this, IDD_DLGBAR_TEST, <br />
		CBRS_RIGHT  | CBRS_GRIPPER |CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_HIDE_INPLACE,<br />
		IDD_VIEW_MENU_DLGBAR)

- I put, in the message map of my CMainFrame, the 2 lines :

ON_COMMAND_EX(IDD_VIEW_MENU_DLGBAR, OnBarCheck)<br />
	ON_UPDATE_COMMAND_UI(IDD_VIEW_MENU_DLGBAR, OnUpdateControlBarMenu)

- then I compile and I built my application.

When I execute this application, I have got :
- the main frame
- the floating dialog box (CDialogBar)

But I haven't got the menu of this floating box !

I search in the source of the demo project but I don't see the menu that we could see in the article.

Perhaps the autor forgot to write something to realize a menu in a CDialogBar?
Or perhaps I don't understand all ...

Could you explain to me how to realize it ?

Thanks very much to help me ! Blush | :O

Alice

Re: how to add a menu to a CDialogBar

JohnCz31-Jan-05 14:19

JohnCz

31-Jan-05 14:19

Maybe this will be disappointment for you but child window cannot have menu. Since dialog bar is a child window (either main frame or floating frame) it will not show menu.

JohnCz

Undo

act_x31-Jan-05 5:41

act_x

31-Jan-05 5:41

How does one implement undo functionality in a Vc++ environment . Always is a definete wish list thing but dont have a clue as to how to implement it .

Engineering is the effort !

Re: Undo

PJ Arends31-Jan-05 6:07

Re: Problem with file output

31-Jan-05 6:07

I would start by typing "Undo" (sans quotes) in the search bar on the top of this page (directly under Bob) and read the articles that are listed.

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Honoured as one of The Most Helpful Members of 2004

Re: Undo

Maximilien31-Jan-05 6:47

Maximilien

31-Jan-05 6:47

since "undo" is a vast and sometimes complex domain, I suggest that you examine the following :

Undoing an operatation depends on the way the operation was done initially.

for example, you do a "create something" operation/command, the undo operation/command might simply be a cut or a remove, or worse, an "uncreate something"; do after that, if you go furher, what is the undo of the undo ( redo ); is it do a "create something" again ? or a paste or something ?

in my opinion, a good undo/redo system depends on the way you handle the different commands ( or actions) in your application.

for example, in a DB, you create a new record, the command that creates the record should contain as much context as possible so that you can recreate the record without any user action.

if you look from the other side.

you remove a record and do an undo, what is the result command ? is it a "create record" or something like a "paste" ?
...

so there are a lot going on here...

Maximilien Lincourt
Your Head A Splode - Strong Bad

Problem with file output

RealityGamma31-Jan-05 5:29

RealityGamma

31-Jan-05 5:29

Im having this wierd problem regarding outputing a file in the same path as the .exe, whenever i save the settings for my app it always save it to the desktop i have no idea why...its suppose to save it in the same path as the exe.. this is the first time ive had this kind of problem, this is almost the same code i always use and yet its not working the way it should be i dont know why.. Frown | :(

heres the code
heres the defined values:

#define FILENAME_S "settings.ini"
#define STRINGi "Font=%s\nFont_Size=%d\nShow_Margin=%d\nShow_Toolbar=%d\nShow_Workspace=%d\nShow_Status=%d\nFile1=%s\nFile2=%s\nFile3=%s\nFile4=%s"

This is part of this FILESTUFF CLass

int FILESTUFF::saveIni( SETTINGS *st )
{
FILE *file;

if( ( file = fopen( FILENAME_S, "w+" ) ) == NULL )
return 0;

stripSpace( st->font, 1 );
stripSpace( st->file1, 1 );
stripSpace( st->file2, 1 );
stripSpace( st->file3, 1 );
stripSpace( st->file4, 1 );

fprintf( file, STRINGi , st->font, st->fontSize, st->showMargin, st->showToolbar, st->showWorkspace, st->showStatusBar, st->file1, st->file2, st->file3, st->file4 );
loadIni( &*st );
fclose( file );
return 1;
}

int FILESTUFF::loadIni( SETTINGS *st )
{
FILE *file;

if( ( file = fopen( FILENAME_S, "r+" ) ) == NULL )
return 0;

fscanf( file, STRINGi , st->font, &st->fontSize, &st->showMargin, &st->showToolbar, &st->showWorkspace, &st->showStatusBar, st->file1, st->file2, st->file3, st->file4 );
stripSpace( st->file1, 0 );
stripSpace( st->file2, 0 );
stripSpace( st->file3, 0 );
stripSpace( st->file4, 0 );
return 1;

fclose( file );
}

I have no idea

PJ Arends31-Jan-05 6:18

Re: Problem with file output

31-Jan-05 6:18

If you only specify the file name, not the entire path as you are doing, then the file will be opened in the current working directory which is not necessarily the same as app's installed directory. To ensure the file is saved in the directory you want it in always specify the full path.

You can use GetModuleFileName() to get the path to the exe.

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Honoured as one of The Most Helpful Members of 2004

RealityGamma31-Jan-05 7:34

RealityGamma

31-Jan-05 7:34

Yeah i can use that function, but there must be an explanation why this is happening, and my current working directory isnt my desktop so it wont be that.. there must be some thing else i did wrong just dont know wht it is...

I have no idea

Re: Problem with file output

David Crow31-Jan-05 9:23

AfxBeginThread, Thread Pool and RUNTIME_CLASS

31-Jan-05 9:23

RealityGamma wrote:
...and my current working directory isnt my desktop...

How are you verifying this?

As has already been mentioned, if you do not specify an absolute path, a relative path is assumed.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Turtle Hand31-Jan-05 4:22

Turtle Hand

31-Jan-05 4:22

I am trying to change an ISAPI Extension so it uses Thread Pooling.
I've downloaded the sample from Microsoft and able to get it running.
The problem I am encountering has to do with the AfxBeginThread
function and a Runtime Class. I don't know how to let the class know
how to pass any parameters through the UI thread.

The unconverted ISAPI Extension uses this call:

CClientSession* pWinThread =

(CClientSession*)AfxBeginThread(RUNTIME_CLASS(CClientSession));

Whereas the sample uses:

CWinThread* pWinThread =
AfxBeginThread((AFX_THREADPROC)ThreadProc, m_hIoPort);

Note the MS Example AfxBeginThread uses the ThreadProc overload, the
existing project however uses CClientSession, which inherits from
CWinThread.

How can I let the CClientSession thread know about m_hIoPort the I/O
Completion Port?

<signature>
It's good to live,
Josef Wainz
Software Developer

Re: AfxBeginThread, Thread Pool and RUNTIME_CLASS

PJ Arends31-Jan-05 6:03

31-Jan-05 6:03

The AfxBeginThread function has a parameter called dwCreateFlags. Set the value of that parameter to CREATE_SUSPENDED, set any of the threads member variables to whatever you want then call CWinThread::ResumeThread to run the thread.

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Honoured as one of The Most Helpful Members of 2004

Automating MS Access

mcsherry31-Jan-05 4:00

mcsherry

31-Jan-05 4:00

Hi all,

can anyone tell me if it is possible to automate MS Access so that I can perform the following tasks from my C++ application:
Open Access
Create a new database
Add a table
Add columns to table
Add data to table
Close table
Close database

I've done similar things for Excel and PowerPoint but can't find any examples on how to do this for Access (I've got as far as getting Access to open, but that is it).

many thanks,
Andy

David Crow31-Jan-05 4:29

31-Jan-05 4:29

Using Automation, just add classes from the msacc9.olb type library. Is there some reason why you can't use ODBC? One of its benefits is that Access is not required to reside on the target machine.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

mcsherry31-Jan-05 21:44

mcsherry

31-Jan-05 21:44

thanks DavidCrow,

unfortunately the program we are coding has a lot of legacy code and libraries in it which clash with a lot of new libraries. We have found that we can use the automation features in Office which don't cause these clashes.

I've already added the type library however I'm not sure the order in which I create the various objects and also what (if any) parameters I need to pass into their constructors. If you could give me any guidance on this it would be most helpfull.

cheers,
Andy

David Crow1-Feb-05 3:21

1-Feb-05 3:21

Unless you are needing something specific from Access (e.g., form, query, report), I think it would be easier to use DAO. Look in the C:\Program Files\Common Files\Microsoft Shared\DAO folder for the type library. Unfortunately the only example I could put together is in VB.

It's helpful to use VB's Object Browser and the C:\Program Files\Common Files\Microsoft Office\Office\1033\Acmain9.chm help file for figuring out classes and objects from the type library.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow